Theodor2005.pdf
Theodor2005.pdf
Theodor2005.pdf
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Cebochoerid Deciduous Dentitions 163<br />
Fig. 1. Deciduous teeth of Cebochoerus lautricensis, MNHN.EBA327. a. buccal view dp2-m2,<br />
b. lingual view of dp2-3, c. buccal view of dp2-3. Scale bars denote 1 cm.<br />
No juvenile specimens of the genus Gervachoerus are known (Erfurt, personal communication).<br />
Juvenile dentitions of Diacodexis (UMMP 79924, 79083, 86533, 82909);<br />
Antiacodon (CMNH 53969), and other artiodactyls, along with the archaeocete Dorudon<br />
(NHM M10174), (Uhen, 2004) were examined for comparison.<br />
We performed a phylogenetic analysis of artiodactyls, whales, and mesonychids, using<br />
a data matrix drawn from characters in the literature (Blainville, 1816; Webb and Taylor,<br />
1980; Cifelli, 1982; Pickford, 1983; Novacek, 1986; Shoshani, 1986; Gentry and Hooker,<br />
1988; Thewissen and Domning, 1992; Thewissen et al., 1994, 2001; Gingerich et al., 1995;<br />
O’Leary and Rose, 1995; Zhou et al., 1995; Theodor, 1996; Geisler and Luo, 1998; Luckett<br />
and Hong, 1998; O’Leary, 1998; O’Leary and Geisler, 1999; Thewissen and Madar, 1999;<br />
Geisler, 2001a) and including new data from the deciduous dentition.<br />
Taxa were chosen to include representatives from most of the basal lineages of artiodactyls,<br />
because any rigorous test of the whale–hippo hypothesis must include these<br />
lineages to polarize the characters and place the hippos and whales within a complete<br />
phylogenetic context. The following taxa are used in this analysis (taxa with genera in<br />
parentheses are composites coded based on all of the genera listed): Arctocyon, Hyopsodus,<br />
Phenacodus, and Meniscotherium are included as outgroups; the archaic ungulate Eoconodon;<br />
the mesonychians Sinonyx, Dissacus, Pachyaena, Harpagolestes, Synoplotherium,<br />
Mesonyx, and Hapalodectes; the cetaceans Artiocetus, Ambulocetus, Pakicetus, Georgiacetus,<br />
Basilosaurus, and Dorudon; and the artiodactyls Diacodexis pakistanensis,<br />
Diacodexis secans, Bunomeryx, Antiacodon, Homacodon, leptochoerid (Stibarus and